1051247605 has 4 divisors (see below), whose sum is σ = 1261497132. Its totient is φ = 840998080.

The previous prime is 1051247579. The next prime is 1051247627. The reversal of 1051247605 is 5067421501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 795183601 + 256064004 = 28199^2 + 16002^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1051247605 is a prime.

It is a super-2 number, since 2×1051247605² = 2210243054036472050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105124756 + ... + 105124765.

It is an arithmetic number, because the mean of its divisors is an integer number (315374283).

Almost surely, 2^1051247605 is an apocalyptic number.

It is an amenable number.

1051247605 is a deficient number, since it is larger than the sum of its proper divisors (210249527).

1051247605 is an equidigital number, since it uses as much as digits as its factorization.

1051247605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210249526.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 1051247605 is about 32422.9487400514. The cubic root of 1051247605 is about 1016.7987565841.

The spelling of 1051247605 in words is "one billion, fifty-one million, two hundred forty-seven thousand, six hundred five".